<template>
  <view>
    <!-- 搜索框 -->
    <view class="search-box">
      <uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
    </view>
    <!-- 搜索结果列表 -->
    <view class="search-list-box" v-if="searchResults.length!==0">
      <view class="search-list-item" v-for="(item,index) in searchResults" :key="index" @click="gotoDetail(item)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="17"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史 -->
    <view class="history-list-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash-filled" size="17" @click="cleanHistory"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list-item">
        <uni-tag :text="item" v-for="(item,index) in histories" :key="index" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        //延时器
        timer: null,
        //关键字
        kw: '',
        // 搜索结果列表
        searchResults: [],
        //搜索历史
        historyList: []
      };
    },
    onLoad() {
      //JSON.parse() 把字符串转成数组
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    computed: {
      histories() {
        return [...this.historyList].reverse()
      }
    },
    methods: {
      //inout输入事件
      input(e) {
        clearTimeout(this.timer)
        this.timer = setTimeout(() => {
          //拿到输入框输入的内容
          this.kw = e.value
          this.getSearchResults()
        }, 500)
      },
      //请求搜索结果数据
      async getSearchResults() {
        if (this.kw === '') {
          this.searchResults = []
          return
        }
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/goods/qsearch', {
          query: this.kw
        })
        if (res.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.message
        //调用保存关键词方法
        this.saveSearchHistory()
      },
      //保存搜索关键词
      saveSearchHistory() {
        // this.historyList.push(this.kw)
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList = Array.from(set)
        //持久化 搜索历史结果
        //JSON.stringify()把数组转化成字符串
        uni.setStorageSync('kw', JSON.stringify(this.historyList))
      },
      //点击搜索列表建议跳转到详情页
      gotoDetail(item) {
        uni.navigateTo({
          url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      // 清空搜索历史记录
      cleanHistory() {
        // 清空 data 中保存的搜索历史
        this.historyList = []
        // 清空本地存储中记录的搜索历史
        uni.setStorageSync('kw', '[]')
      },
      //点击历史记录关键词跳转到商品列表页面
      gotoGoodsList(kw) {
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?query=' + kw
        })
      }
    }

  }
</script>

<style lang="scss">
  .search-box {
    position: sticky;
    top: 0;
    z-index: 999;
  }

  .search-list-box {
    padding: 0 5px;

    .search-list-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 12px;
      padding: 13px 0;
      border-bottom: 1px solid #efefef;

      .goods-name {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
      }
    }
  }

  .history-list-box {
    padding: 0 5px;

    .history-title {
      display: flex;
      justify-content: space-between;
      height: 40px;
      align-items: center;
      font-size: 13px;
      border-bottom: 1px solid #efefef;
    }

    .history-list-item {
      display: flex;
      flex-wrap: wrap;

      .uni-tag {
        margin-top: 5px;
        margin-right: 5px;
      }
    }

  }
</style>